|Year|Competition|Venue|Position|Event|Notes|
|---|---|---|---|---|---|
|1990|Central American and Caribbean Games|Mexico City, Mexico|1st|3000 m s'chase||
|1991|Pan American Games|Havana City, Cuba|6th|3000 m s'chase||
|1992|Olympic Games|Barcelona, Spain|6th|10,000 m||
|1993|World Championships|Stuttgart, Germany|9th|10,000 m||
|1994|World Half Marathon Championships|Oslo, Norway|2nd|Half marathon|1:00:28 PB|
|1994|New York City Marathon|New York City, United States|1st|Marathon||
|1994|London Marathon|London, England|3rd|Marathon||
|1995|World Championships|Gothenburg, Sweden|13th|10,000 m||
|1995|New York City Marathon|New York City, United States|1st|Marathon||
|1996|Olympic Games|Atlanta, United States|6th|Marathon||
|1997|New York City Marathon|New York City, United States|5th|Marathon||
|1997|Boston Marathon|Boston, United States|4th|Marathon||

Question: what is the number of marathons that silva ran in the united states?
Answer: 5